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Hello. The erratic idling could be caused by several things: You could have a bad mass air flow sensor, the throttle position sensor could be bad, or the idle air control valve could be bad. This could also be an indication of a problem with the fuel system, or a very bad vacuum leak in the engine. I suggest you have all of these possible issues checked as soon as possible because they all could make the car idle erratically. A diagnostic test of the erratic idling would best be done by a certified technician, like one from YourMechanic.

Q: Where is purge valve for evap canister 07 honda civic si

The purge valve is mounted on the engine and you will see hose connections from the valve to the intake manifold as well as a wire harness connection. The purge valve should be tested to determine if it is actually...

Q: Sparkplug wires melting in sparkplug socket.

From what you've described, the cylinder head overheated which caused the wires to melt. Your engine is overheating and the white smoke from the exhaust indicates that the head gasket is blown or cracked. You should have the car looked...

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